/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.spark.sql.sedona_viz.expressions

import java.io.ByteArrayOutputStream
import java.util.Base64

import javax.imageio.ImageIO
import org.apache.sedona.viz.core.Serde.ImageWrapperSerializer
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.Expression
import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
import org.apache.spark.sql.catalyst.util.ArrayData
import org.apache.spark.sql.types.{DataType, StringType}
import org.apache.spark.unsafe.types.UTF8String

case class ST_EncodeImage(inputExpressions: Seq[Expression])
    extends Expression
    with CodegenFallback {
  assert(inputExpressions.length == 1)
  override def nullable: Boolean = false

  override def eval(input: InternalRow): Any = {
    val inputArray = inputExpressions(0).eval(input).asInstanceOf[ArrayData]
    val serializer = new ImageWrapperSerializer
    val image = serializer.readImage(inputArray.toByteArray()).getImage
    val os = new ByteArrayOutputStream()
    ImageIO.write(image, "png", os)
    UTF8String.fromString(Base64.getEncoder.encodeToString(os.toByteArray))
  }

  override def dataType: DataType = StringType

  override def children: Seq[Expression] = inputExpressions

  protected def withNewChildrenInternal(newChildren: IndexedSeq[Expression]) = {
    copy(inputExpressions = newChildren)
  }
}
